cn=monitor and timing?

I was wondering if it would be possible in cn=monitor to track the average
time it takes slapd to respond to different operations, like ADD, MOD,
SEARCH, DELETE. This could provide some useful information on server
performance (although full-DB searches would of course add a bit of time to
averages. :P ). Maybe something like top does -- Track the 1, 5, and 15
minute averages or something.